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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.    
 */
package org.apache.tuscany.sca.implementation.java.introspect.impl;

import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.logging.Logger;
import org.apache.tuscany.sca.assembly.AssemblyFactory;
import org.apache.tuscany.sca.assembly.Service;
import org.apache.tuscany.sca.implementation.java.IntrospectionException;
import org.apache.tuscany.sca.implementation.java.JavaImplementation;
import org.apache.tuscany.sca.implementation.java.impl.JavaElementImpl;
import org.apache.tuscany.sca.interfacedef.InvalidInterfaceException;
import org.apache.tuscany.sca.interfacedef.java.JavaInterface;
import org.apache.tuscany.sca.interfacedef.java.JavaInterfaceContract;
import org.apache.tuscany.sca.interfacedef.java.JavaInterfaceFactory;

/**
 * Processes an {@link org.osoa.sca.annotations.Service} annotation and updates
 * the component type with corresponding {@link Service}s. Also processes
 * related {@link org.osoa.sca.annotations.Callback} annotations.
 * 
 * @version $$
 */
public class ConsumerProcessor extends BaseJavaClassVisitor {
	@SuppressWarnings("unused")
    private static final Logger logger = Logger.getLogger(ConsumerProcessor.class.getName());

    private JavaInterfaceFactory javaFactory;
    
    public ConsumerProcessor(AssemblyFactory assemblyFactory, JavaInterfaceFactory javaFactory) {
        super(assemblyFactory);
        this.javaFactory = javaFactory;
    }
    
    @Override
    public void visitMethod(Method method, JavaImplementation type) throws IntrospectionException {

    	org.osoa.sca.annotations.Consumer annotation = method.getAnnotation(org.osoa.sca.annotations.Consumer.class);
        if (annotation == null) {
            return;
        }
        if(Modifier.isPrivate(method.getModifiers())) {
            throw new IllegalConsumerException("Illegal annotation @Consumer found on "+method, method);
        }
        if (method.getParameterTypes().length != 1) {
            throw new IllegalConsumerException("Consumer must have one parameter", method);
        }
        JavaElementImpl element = new JavaElementImpl(method.getDeclaringClass());
        try {
			createConsumer(type, element, annotation.name(), method.getName());
		} catch (InvalidInterfaceException e) {
			throw new IntrospectionException(e);
		}
    }

    /**
     * @param type
     * @param element
     * @throws IllegalConsumerException
     */
    private void createConsumer(JavaImplementation type, JavaElementImpl element, String consumerName, String operationName)
        throws IllegalConsumerException, InvalidInterfaceException {
    	
        Class<?> consumerClass = element.getType();
        
        org.apache.tuscany.sca.assembly.Consumer consumer = assemblyFactory.createConsumer();
        JavaInterfaceContract interfaceContract = javaFactory.createJavaInterfaceContract();
        consumer.setInterfaceContract(interfaceContract);
        consumer.setName(consumerName);       
        JavaInterface consumerInterface = javaFactory.createJavaInterface();
        consumerInterface.setRemotable(true);
        javaFactory.createJavaInterface(consumerInterface, consumerClass);
        consumer.getInterfaceContract().setInterface(consumerInterface);
        consumer.setOperationName(operationName);

        type.getConsumers().add(consumer);
    }
    

}